Cancelled services but still debiting bank account

I cancelled my LTE service at end of March when I migrated over to Fibre with Telkom. At end of April they still billed me for the LTE service. I contacted Telkom and they re-did the cancellation on 5th May 2019which was originally confirmed to be done in April. Thereafter the LTE service stopped working. At end of May another R899 was taken out of my account for the LTE service. Thus Telkom is debiting my account for a service that has been cancelled. When I query they give a reference number to follow up on and no one come back on how it was resolved and will they refund me.

Seems the best going forward is to cancel all my services with Telkom and look for another service provider, very unprofessional company